.slide-bar{
  height: 100%;
  position: fixed;
  z-index: 999;
  right: 0;
  opacity: .7;
  bottom: 10px;
  margin-right: 10px;
  display: flex;
  align-items: center;
  flex-direction: column;
  justify-content: flex-end;
}
.hide-button {
  // 保证位置依然被占用
  opacity: 0;
}
